The following tests and procedures will be done to monitor for recurrence of lung cancer. These visits are the same, regardless of whether one is taking a short course, or a long course of afatinib. There will be clinic visits once every 6 months for 3 years (months 7, 13, 19, 25, 31, 37 and 49), and then one more visit 1 year later. The following tests and procedures will be done at these follow up visits: a CT scan of the chest, routine blood tests, performance status and a physical exam, including height and weight.